To provide an air conditioner capable of properly controlling an operation of a driving motor by adequately grasping a state of an automatic cleaning mechanism.

In this air conditioner including the automatic cleaning mechanism for cleaning a filter, a driving stepping motor for operating the automatic cleaning mechanism, an electric current detecting circuit for detecting change of electric current flowing in the stepping motor at a constant frequency, and a control means for operating the stepping motor, the stepping motor is stopped or reversely operated when the number of times when an electric current value detected by the electric current detecting circuit is less than a first reference value and more than a second reference value determined in the control means within a prescribed time, reaches a prescribed number of times or more.